Y \ X
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
3780
3779
3778
3777
3776
3775
3774
3773
3772
3771
3770
3769
3768
3767
3766
3765
3764
3763
3762
3761
3760